JP2005105345A - Method for producing austenitic stainless steel sheet excellent in uniformity of surface - Google Patents
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本発明は、オーステナイト系ステンレス鋼の熱間圧延した鋼板を、焼鈍し酸洗して鋼板を製造する方法に関する。 The present invention relates to a method for producing a steel sheet by annealing and pickling a hot-rolled steel sheet of austenitic stainless steel.
オーステナイト系ステンレス鋼の連続鋳造鋳片を熱間圧延し、溶体化処理し、酸洗して鋼板を製造する方法は、非特許文献1に示すように、熱間仕上鋼板製品や厚板製品を製造するために行われている。また、表面性状を良好にする工夫は、例えば特許文献1には、熱間仕上鋼板や厚板製品の製造法として、連続鋳造鋳片の表面手入れを行わずに製造する場合に、オシレーションマーク部が酸洗後の鋼板に残存しない様にするため、溶体化時の加熱雰囲気と酸洗前のショットブラスト条件を調整する方法として開示されている。
しかし、この様な従来開示された方法で製造しても、酸洗後の鋼板表面に水玉状、流水状あるいは地図状を有する模様が生じ、表面均一性の劣った鋼板になることが判明した。 本発明の目的は、従来技術では達成できなかった、酸洗後の鋼板表面に発生する水玉状、流水状あるいは地図状を有する模様を根本的に防止し、酸洗後の表面品位を均一性に優れた良好な鋼板を提供することにある。 However, even when manufactured by such a conventionally disclosed method, it was found that a pattern having a polka dot shape, a flowing water shape or a map shape is formed on the surface of the steel plate after pickling, resulting in a steel plate with poor surface uniformity. . The object of the present invention is to fundamentally prevent a pattern having a polka dot shape, a flowing water shape or a map shape generated on the surface of a steel plate after pickling, which could not be achieved by the prior art, and uniform surface quality after pickling. It is to provide a good steel sheet excellent in the above.
上記目的を達成するために、本発明は以下の構成からなる。
(1) オーステナイト系ステンレス鋼を連続鋳造装置により鋳造し、熱間圧延し、焼鈍し、その後デスケール酸洗を行う鋼板の製造方法において、熱間圧延後の冷却を、鋼板温度が600℃未満になるまで放冷することを特徴とするオーステナイト系ステンレス鋼板の製造方法。
(2) オーステナイト系ステンレス鋼を連続鋳造装置により鋳造し、熱間圧延し、焼鈍し、その後デスケール酸洗を行う鋼板の製造方法において、熱間圧延後の冷却を、鋼板温度が800℃を超える温度から水冷を開始することを特徴とするオーステナイト系ステンレス鋼板の製造方法。
(3) オーステナイト系ステンレス鋼を連続鋳造装置により鋳造し、熱間圧延し、焼鈍し、その後デスケール酸洗を行う鋼板の製造方法において、熱間圧延後の冷却を、鋼板温度が800℃以下になるまで放冷した後、800℃を超える温度まで復熱または昇熱させてから水冷を開始することを特徴とするオーステナイト系ステンレス鋼板の製造方法。
(4) オーステナイト系ステンレス鋼を連続鋳造装置により鋳造し、引き続き熱間圧延し、焼鈍し、その後デスケール酸洗を行う鋼帯の製造方法において、熱間圧延後に水冷し、焼鈍条件として1070℃以上の温度で5分間以上保持することを特徴とするオーステナイト系ステンレス鋼板の製造方法。
(5) 焼鈍条件として、1100℃以上の温度で15分間以上保持することを特徴とする前記(4)に記載のオーステナイト系ステンレス鋼板の製造方法。
(6) 熱間圧延後の冷却を、鋼板温度が600〜800℃になるまで放冷した後、水冷を開始することを特徴とする前記(4)または(5)に記載のオーステナイト系ステンレス鋼板の製造方法。
In order to achieve the above object, the present invention comprises the following arrangement.
(1) In a method for producing a steel sheet in which austenitic stainless steel is cast by a continuous casting apparatus, hot-rolled, annealed, and then descaled and pickled, cooling after hot-rolling is performed at a steel sheet temperature of less than 600 ° C. The method for producing an austenitic stainless steel sheet, characterized by being allowed to cool to the end.
(2) In a method for producing a steel sheet in which austenitic stainless steel is cast by a continuous casting apparatus, hot-rolled, annealed, and then descaled and pickled, cooling after hot-rolling is performed, and the steel sheet temperature exceeds 800 ° C. A method for producing an austenitic stainless steel sheet, characterized by starting water cooling from a temperature.
(3) In the manufacturing method of a steel plate in which austenitic stainless steel is cast by a continuous casting apparatus, hot-rolled, annealed, and then descaled and pickled, cooling after hot rolling is performed at a steel plate temperature of 800 ° C. or lower. A method for producing an austenitic stainless steel sheet, wherein the method is allowed to cool to room temperature, and then recools or heats up to a temperature exceeding 800 ° C. and then starts water cooling.
(4) Austenitic stainless steel is cast by a continuous casting apparatus, followed by hot rolling, annealing, and then descaling pickling. In the steel strip manufacturing method, water cooling is performed after hot rolling, and the annealing condition is 1070 ° C or higher. The manufacturing method of the austenitic stainless steel plate characterized by hold | maintaining at the temperature of 5 minutes or more.
(5) The method for producing an austenitic stainless steel sheet according to (4), wherein the annealing is performed at a temperature of 1100 ° C. or more for 15 minutes or more as an annealing condition.
(6) The austenitic stainless steel sheet according to (4) or (5), wherein the cooling after hot rolling is allowed to cool until the steel sheet temperature reaches 600 to 800 ° C., and then water cooling is started. Manufacturing method.
本発明によって従来技術では達成の難しいとされた、オーステナイト系ステンレス鋼の製品酸洗板で生じる水玉状、流水状あるいは地図状を有する模様を根本的に防止し、酸洗後の表面品位を均一性に優れた良好な鋼板にすることができる。 The present invention fundamentally prevents polka dots, flowing water or map-like patterns that occur on the pickling plate of austenitic stainless steel, which has been difficult to achieve with the prior art, and ensures uniform surface quality after pickling. It is possible to make a good steel sheet with excellent properties.
本発明者らは種々の詳細な検討を行った結果、オーステナイト系ステンレス鋼板の酸洗後の鋼帯表面に発生する水玉状、流水状あるいは地図状を有する模様を根本的に防止し、酸洗後の表面品位を均一性に優れた良好な鋼板にする方法として、始めに熱延後の冷却条件に着目し、放冷から水冷を開始する温度を適切にすることで模様を防止できることを知見した。以下、実験結果に従い説明する。 As a result of various detailed studies, the present inventors have fundamentally prevented a pattern having a polka dot shape, a flowing water shape or a map shape generated on the surface of a steel strip after pickling of an austenitic stainless steel plate, and pickling. As a method of making a good steel sheet with excellent surface quality later, focusing on the cooling conditions after hot rolling, we found that the pattern can be prevented by adjusting the temperature to start water cooling from standing to cool did. Hereinafter, it demonstrates according to an experimental result.
SUS304鋼について、連続鋳造した200mm厚スラブを5mm厚に熱間圧延し、熱延後の鋼帯は400〜900℃の間で水冷し、1050℃で10分間焼鈍した後水冷し、ショットブラストでメカニカルデスケーリングし、硝弗酸溶液で酸洗した。 For SUS304 steel, a continuously cast 200 mm thick slab was hot-rolled to 5 mm thickness, and the steel strip after hot rolling was water-cooled between 400-900 ° C, annealed at 1050 ° C for 10 minutes, then water-cooled, and shot blasting Mechanical descaling and pickling with nitric hydrofluoric acid solution.
酸洗後に生成する、水玉状、流水状あるいは地図状を有する模様の発生した源は、熱処理直後の水冷時点であり、この時点で酸化スケールの剥離した部分が100〜500mm大の不定形ムラとなり、後のショットブラストや酸洗により修復されることなく水玉状、流水状あるいは地図状を有する模様となった。 The source of the polka dot, flowing water or map pattern generated after pickling is the time of water cooling immediately after the heat treatment, and the part where the oxide scale is peeled becomes irregular irregularities of 100 to 500 mm in size at this point. The pattern had a polka dot shape, a flowing water shape or a map shape without being repaired by subsequent shot blasting or pickling.
模様の発生状況について、熱延後の冷却条件との関係を調査した結果、(1)熱延後に放冷した材料に発生はなかった。(2)熱延後の放冷途中に水冷した場合の結果は、表1に示す様に、水冷開始温度が600〜800℃の時に模様を生成する特徴があった。(3)600〜800℃で水冷可能な鋼板をさらに放冷し、600℃未満を待って水冷した場合には模様の発生はなかった。(4)600〜800℃で水冷可能な鋼板を復熱あるいは昇熱することで800℃を超える温度まで上昇させ、実際に水冷を開始した温度が800℃を超えた温度にした場合にも模様の発生はなかった。 As a result of investigating the relationship between the pattern generation state and the cooling conditions after hot rolling, (1) there was no generation in the material allowed to cool after hot rolling. (2) As shown in Table 1, the result of water cooling in the middle of cooling after hot rolling was characterized in that a pattern was generated when the water cooling start temperature was 600 to 800 ° C. (3) When the steel sheet capable of water cooling at 600 to 800 ° C. was further allowed to cool and then cooled to below 600 ° C., no pattern was generated. (4) Even when the steel plate that can be cooled with water at 600 to 800 ° C is reheated or heated up to a temperature exceeding 800 ° C, the temperature at which the water cooling is actually started exceeds 800 ° C. There was no outbreak.
このように、熱延後の放冷途中に水冷した場合、水冷開始温度が600〜800℃の時に模様を発生する理由は明らかではないが、600〜800℃の温度範囲での粒界へのクロム炭化物の生成に伴いCr欠乏を生じ、鋭敏化が生じ易く、しかも熱延後に表面に生成している酸化スケールの微妙な違いで鋭敏化のマクロ的な不均一性が生じるためと推定される。従って、600〜800℃の温度域での水冷開始を避けることで、鋭敏化のマクロ的な不均一性をなくすことができ、製品板の模様をなくすことができる。 Thus, when water-cooling is performed in the middle of cooling after hot rolling, the reason for generating a pattern when the water-cooling start temperature is 600 to 800 ° C. is not clear, but the grain boundary in the temperature range of 600 to 800 ° C. is not clear. It is presumed that Cr deficiency occurs due to the formation of chromium carbide, sensitization is likely to occur, and macroscopic heterogeneity of sensitization occurs due to subtle differences in oxide scale generated on the surface after hot rolling. . Therefore, by avoiding the start of water cooling in the temperature range of 600 to 800 ° C., the macroscopic nonuniformity of sensitization can be eliminated and the pattern of the product plate can be eliminated.
次に本発明者らは、熱間圧延後の焼鈍条件に着目し、前記熱延後の水冷開始温度が600〜800℃の時でも、焼鈍の温度と時間を適正にすることにより模様を防止できることを知見した。以下、実験結果に従い説明する。 Next, the inventors pay attention to the annealing conditions after hot rolling, and prevent the pattern by making the annealing temperature and time appropriate even when the water cooling start temperature after hot rolling is 600 to 800 ° C. I found out that I can do it. Hereinafter, it demonstrates according to an experimental result.
SUS304鋼について、連続鋳造した200mm厚スラブを5mm厚に熱間圧延し、熱間圧延後の鋼板は、前記実験において模様が生じる条件の、熱間圧延後に700℃から水冷した鋼板について、焼鈍温度を1000〜1200℃、時間を0〜40分の間で種々変更して処理し、ショットブラストでメカニカルデスケーリングし、硝弗酸溶液で酸洗した。焼鈍条件と模様の関係を調査した結果を図1にまとめて示す。 For SUS304 steel, a continuously cast 200 mm thick slab was hot rolled to a thickness of 5 mm. Were processed at various temperatures between 1000 ° C. and 1200 ° C. and the time between 0 and 40 minutes, mechanically descaled with shot blasting, and pickled with nitric hydrofluoric acid solution. The results of investigating the relationship between annealing conditions and patterns are summarized in FIG.
図1から、焼鈍条件として1070℃以上の温度で5分間以上保持すれば模様が軽度となり、さらに望ましくは1100℃以上の温度で15分間以上の保持を行えば、模様のない、酸洗後の表面品位を均一性に優れた良好な鋼板にすることができる。
このように、焼鈍温度と時間を確保することで、模様が軽減もしくは解消される理由は明白でないが、前記鋭敏化のマクロ的な不均一性が、高温かつ長時間の焼鈍により解消されるためであると推定される。
From FIG. 1, the pattern becomes mild if held at a temperature of 1070 ° C. or higher for 5 minutes or more as an annealing condition, and more desirably, if the holding is performed at a temperature of 1100 ° C. or higher for 15 minutes or longer, there is no pattern, A good steel sheet with excellent surface quality and uniformity can be obtained.
In this way, the reason why the pattern is reduced or eliminated by securing the annealing temperature and time is not clear, but the macro-uniformity of the sensitization is eliminated by annealing at a high temperature for a long time. It is estimated that.
次に限定理由について説明する。
オーステナイト系ステンレス鋼に限定した理由は、本発明が課題とする模様の発生が、Crを7〜22%とNiを4〜12%含有するオーステナイト系ステンレス鋼に特有に見られる現象のため限定した。さらに、製造工程を連続鋳造装置により鋳造し、引き続き熱間圧延した直後に水冷し、焼鈍し、その後デスケール酸洗を行う鋼板に限定したのも同様の理由である。
Next, the reason for limitation will be described.
The reason for limiting to austenitic stainless steel was limited to the phenomenon that the present invention has a problem due to a phenomenon peculiar to austenitic stainless steel containing 7 to 22% Cr and 4 to 12% Ni. . Further, for the same reason, the manufacturing process is limited to a steel plate which is cast by a continuous casting apparatus, followed by water cooling immediately after hot rolling, annealing, and then descaling pickling.
熱間圧延後の冷却条件は、すでに述べたように、鋼板温度が600〜800℃において水冷を開始しないことが本発明の重要な要件であるので、(1)鋼板温度が600℃未満になるまで放冷する、(2)鋼板温度が800℃を超える温度から水冷を開始する、(3)鋼板温度が800℃以下になるまで放冷した後、800℃を超える温度まで復熱または昇熱させてから水冷を開始する、のいずれかの条件とすることが必要である。
なお、(1)において、鋼板温度が600℃未満となった後は、水冷しても、引き続き放冷しても良いが、生産性の点からは水冷した方が好ましい。
As described above, the cooling condition after the hot rolling is that the water cooling is not started when the steel plate temperature is 600 to 800 ° C., so (1) the steel plate temperature is less than 600 ° C. (2) Water cooling is started from a temperature where the steel plate temperature exceeds 800 ° C., (3) Reheating or heating up to a temperature exceeding 800 ° C. It is necessary to satisfy any one of the conditions of starting water cooling after allowing the water to cool.
In (1), after the steel sheet temperature is less than 600 ° C., it may be cooled with water or may be allowed to cool. However, from the viewpoint of productivity, water cooling is preferred.
また、熱間圧延後の鋼板温度が600〜800℃で水冷を開始した場合においても、その後の焼鈍条件として、1070℃以上の温度で5分間以上の保持、さらに望ましくは1100℃以上の温度で15分間以上保持することで、酸洗後の鋼板表面に模様が発生せず、均一性に優れた鋼板を得ることができるためである。無論、熱間圧延後の水冷開始温度を600未満もしくは800℃超からとした場合にこの条件を実施しても差し支えない。 Further, even when water cooling is started at a steel plate temperature of 600 to 800 ° C. after the hot rolling, as a subsequent annealing condition, it is held at a temperature of 1070 ° C. or more for 5 minutes or more, more preferably at a temperature of 1100 ° C. or more. This is because by holding for 15 minutes or more, a pattern is not generated on the surface of the steel plate after pickling, and a steel plate having excellent uniformity can be obtained. Of course, this condition may be carried out when the water cooling start temperature after hot rolling is less than 600 or more than 800 ° C.
表1に示す成分を含有し、残部Feおよび不可避的不純物からなるオーステナイト系ステンレス鋼のSUS304、SUS304L、SUS316L鋼について、連続鋳造装置により鋳造した150〜250mm厚スラブを2〜6mmまで熱間圧延した。熱間圧延後の鋼板は、表2に示す400〜900℃の間で水冷する場合と、水冷せず放冷する場合を実施した。
焼鈍温度と時間を変更し焼鈍した後水冷し、ショットブラストでメカニカルデスケーリングし、40〜55℃の150g/L硝酸−70g/L弗酸を含有する硝弗酸溶液で酸洗した。
Austenitic stainless steel SUS304, SUS304L, SUS316L steel containing the components shown in Table 1 and the balance Fe and inevitable impurities was hot-rolled to a thickness of 2 to 6 mm from a 150 to 250 mm thick slab cast by a continuous casting apparatus. . The steel sheet after hot rolling was subjected to water cooling between 400 to 900 ° C. shown in Table 2 and to cooling without water cooling.
After changing the annealing temperature and time, annealing was performed, followed by water cooling, mechanical descaling by shot blasting, and pickling with a nitric hydrofluoric acid solution containing 150 g / L nitric acid-70 g / L hydrofluoric acid at 40 to 55 ° C.
熱間圧延後の鋼板を水冷せず放冷した場合、あるいは、600〜800℃の間で水冷しても焼鈍条件として1070℃以上の温度で5分間以上保持した場合、さらに1100℃以上の温度で15分間以上保持をした場合良好になった。一方600〜800℃の間で水冷し焼鈍条件が不適切な場合には、最終酸洗後に水玉状、流水状あるいは地図状を有する模様が生じた。 When the hot-rolled steel sheet is allowed to cool without water cooling, or even if it is water-cooled between 600-800 ° C., if it is kept at a temperature of 1070 ° C. or more for 5 minutes or more as an annealing condition, a temperature of 1100 ° C. or more is further increased. When it was held for 15 minutes or more, it became good. On the other hand, when it was water-cooled between 600 to 800 ° C. and the annealing conditions were inappropriate, a pattern having a polka dot shape, a flowing water shape or a map shape was formed after the final pickling.
Claims (6)
鋼板温度が800℃以下になるまで放冷した後、800℃を超える温度まで復熱または昇熱させてから水冷を開始することを特徴とするオーステナイト系ステンレス鋼板の製造方法。 Austenitic stainless steel is cast by a continuous casting machine, hot-rolled, annealed, and then subjected to descale pickling.
A method for producing an austenitic stainless steel sheet, wherein the steel sheet is allowed to cool to a temperature of 800 ° C. or lower and then recooled or heated to a temperature exceeding 800 ° C. and then water cooling is started.
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KR101697094B1 (en) * | 2015-10-06 | 2017-01-17 | 주식회사 포스코 | Austenitic stainless steel with improved surface quality and method of manufacturing the same |
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